Add the fresh herbs to the work bowl of a Cuisinart® food processor fitted with the metal blade. Process for 20 seconds to mince; remove and reserve. Insert the 6 mm slicing blade. Use medium pressure to slice the onion; use light pressure to slice the peppers. Remove and reserve. Use medium pressure to slice the zucchini and yellow squash. Remove and reserve (do not combine with onions and peppers). Place the oil in a Cuisinart® Hard Anodized Non-Stick 12-1/2 - inch Stir-Fry Pan over medium - high heat. When hot, add the onions and peppers, cook to soften, about 3 - 4 minutes. Add the squashes and salt, cook until tender and lightly golden brown, stirring now and then, about 8 - 10 minutes. Add the vinegar, reduce until it is a glaze. Stir in the reserved chopped fresh herbs and the pepper. Serve hot.